Smt Repair Techniques; Spare Cans - Tait TM9100 Service Manual

Spare Cans

4.7

SMT Repair Techniques

Standard Procedures
Non-standard
Procedures
110 General Information
It is good practice to discard any can that has been removed and replace
it with a spare can. If this is not done, special precautions are needed
when re-installing the original can. These precautions are discussed as
part of the training for accreditation.
Service centers carrying out level-2 repairs are expected to be familiar
with the standard techniques for the replacement of SMT components.
However, certain components on the main board require non-standard
techniques and these are discussed below. Another issue of concern is the
procedure for removing and installing cans. A discussion of the issue
concludes this section.
Do not use the standard SMT repair techniques when replacing the
capacitors C548 and C565 and the inductors L601 and L602.
The standard techniques tend to produce excessive heat, which will
damage these components. Do not use a hot-air tool or heat gun. Instead
use solder paste and a standard soldering iron with an iron tip with a
specified temperature of 600°F (315°C). The capacitors are part of the
frequency-synthesizer circuitry under the
part of the SMPS of the power-supply circuitry on the bottom-side of
the board. Figure 4.5 on page 111
components.
can. The inductors are
SYN TOP
shows the locations of the
TM9100 Service Manual
© Tait Electronics Limited August 2005